Datasets:
Corpus-NZ
/
Code-Syntax-Expanded

Dataset card Data Studio Files
xet
 Community
wrong_code
stringlengths
3
123
correct_code
stringlengths
3
155
explanation
stringclasses
101 values
language
stringclasses
26 values
def baz(result): return result + 1
def baz(result): return result + 1
Correct.
Python
if ($a = 47) {{}}
if ($a -eq 47) {{}}
Use -eq.
PowerShell
if z = 32
if z == 32
Use ==.
Ruby
let data = 'result'
let data = "result"
Double quotes.
Swift
<img src='message.jpg'>
<img src='message.jpg' alt='desc'>
Add alt text.
HTML
if (c) console.log('yes') else console.log('no')
if (c) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
JOIN orders ON items.id = orders.id
JOIN orders ON items.id = orders.id
Correct.
SQL
for (int i=0; i<27; i++) {{}}
for (int i=0; i<27; i++) {{}}
Correct.
Java
{ "name": "value" }
{ "name": "value" }
Correct.
JSON
object Person {{ def main(args: Array[String]) = println("result") }}
object Person {{ def main(args: Array[String]): Unit = println("result") }}
Add return type Unit.
Scala
<center>output</center>
<div style='text-align:center;'>output</div>
Use CSS.
HTML
void main() {{ print('test') }}
void main() {{ print('test'); }}
Add semicolon.
Dart
fmt.Println 'result'
fmt.Println('result')
Missing parentheses.
Go
INSERT INTO items VALUES ('message',59)
INSERT INTO items (age, email) VALUES ('message',59);
Specify columns.
SQL
for i=1,34 do print(i) end
for i=1,34 do print(i) end
Correct.
Lua
[x*x for x in items if x > 13]
[x*x for x in items if x > 13]
Correct list comprehension.
Python
print 'world'
print 'world';
Add semicolon.
Perl
class Item def method end end
class Item def method end end
Correct.
Ruby
<p>output <b>hello</p></b>
<p>output <b>hello</b></p>
Nest properly.
HTML
class Order {{ int data; }};
class Order {{ public: int data; }};
Make public.
C++
for (item in list)
for (item of list)
for...in iterates keys.
JavaScript
x := 98
x := 98
Correct.
Go
cin >> bar cout << bar;
cin >> bar; cout << bar;
Add semicolon.
C++
let item = 53;
let item = 53;
Correct.
JavaScript
$result = 11; if ($result = 11) {{}}
$result = 11; if ($result == 11) {{}}
Use ==.
PHP
<br></br>
<br>
Self-closing.
HTML
let x: i32 = "info";
let x: &str = "info";
Type mismatch.
Rust
if index = 19
if index == 19
Use ==.
Go
if (val = 93) {{}}
if (val === 93) {{}}
Use === for equality.
JavaScript
let x = 77; let x = 22;
let x = 77; x = 22;
Duplicate declaration.
JavaScript
foo
foo()
Add parentheses.
Kotlin
while read line; do echo $line; done < config.json
while read line; do echo $line; done < config.json
Correct.
Shell
let result = 'hello'
let result = "hello"
Double quotes.
Swift
if ($index = 82)
if ($index == 82)
Use ==.
Perl
[89, 54, 90
[89, 54, 90]
Close bracket.
Ruby
<center>test</center>
<div style='text-align:center;'>test</div>
Use CSS.
HTML
if val = 91:
if val == 91:
Use == for comparison.
Python
function foo(x:string){{return x;}} foo(8);
function foo(x:string){{return x;}} foo('world');
Pass correct type.
TypeScript
if data > 3 puts 'data'
if data > 3 puts 'data' end
Add 'end'.
Ruby
int &ref;
int x; int &ref = x;
Reference must be initialized.
C++
let bar = 61;
let bar = 61;
Correct.
JavaScript
JOIN profiles ON items.id = profiles.status
JOIN profiles ON items.id = profiles.status
Correct.
SQL
<hr></hr>
<hr>
Self-closing.
HTML
cin >> y;
int y; cin >> y;
Declare variable.
C++
int main() {{ return 0; }}
int main() {{ return 0; }}
Correct.
C++
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(74);
const express = require('express'); const app = express(); app.get('/', (req,res) => res.send('message')); app.listen(74, () => console.log('listening'));
Add callback.
Node.js
fs.readFile('input.csv', (err,data) => {{ if(err) throw err; }});
fs.readFile('input.csv', (err,data) => {{ if(err) {{ console.error(err); return; }} }});
Better error handling.
Node.js
{{"name":"world" "title":54}}
{{"name":"world", "title":54}}
Add comma.
JSON
list[21]
if list.indices.contains(21) {{ list[21] }}
Check index.
Swift
for i=1,39 do print(i) end
for i=1,39 do print(i) end
Correct.
Lua
Write-Host 'world'
Write-Host 'world'
Correct.
PowerShell
var x int
var x int
Correct.
Go
name: output age: 23
name: output age: 23
Correct.
YAML
// comment
/* comment */
Use /* */.
CSS
const int x; x = 5;
const int x = 5;
Const must be initialized.
C++
let y: Int = 'info'
let y: String = 'info'
Fix type.
Swift
if (index = 17) {{}}
if (index == 17) {{}}
Use ==.
Java
var x = 5; x = "hello"
var x = "hello"
Type mismatch.
Swift
x := 4
x := 4
Correct.
Go
for b in range(96) print(b)
for b in range(96): print(b)
Colon after for.
Python
List(27,31,51)
List(27,31,51)
Correct.
Scala
x = 5; if x > 3, disp('large'), end
x = 5; if x > 3, disp('large'), end
Correct.
MATLAB
p {{ color: #333 }}
p {{ color: #333; }}
Add semicolon.
CSS
type MyType = string | number; let x: MyType = true;
type MyType = string | number; let x: MyType = 'hello';
Type not in union.
TypeScript
for i in $(ls); do echo $i; done
for i in $(ls); do echo $i; done
Correct.
Shell
local z = 19
local z = 19
Correct.
Lua
String name = 'data';
String name = 'data';
Correct.
Dart
const p:Person = {{name:'world'}};
const p:Person = {{name:'world', age:52}};
Add missing property.
TypeScript
let a: number = 'hello';
let a: string = 'hello';
Fix type.
TypeScript
console.log('data'
console.log('data')
Close parenthesis.
JavaScript
<person age=20>
<person age="20">
Quote attribute.
XML
let mut index=2; let ref1=&mut index; let r2=&mut index;
let mut index=2; {{ let ref1=&mut index; }} let r2=&mut index;
Only one mutable borrow.
Rust
<root><child>text</child></root>
<root><child>text</child></root>
Correct.
XML
if (val) console.log('yes') else console.log('no')
if (val) console.log('yes'); else console.log('no');
Missing semicolon.
JavaScript
<ul><li>test<li>test</ul>
<ul><li>test</li><li>test</li></ul>
Close li.
HTML
switch(data){{ case 68: break; }}
switch(data){{ case 68: break; default: break; }}
Add default case.
Java
function test() {{ echo 'world'; }}
function test() {{ echo 'world'; }}
Correct.
PHP
if (a = 55)
if (a == 55)
Use ==.
Scala
result = test
result = 'test'
Quote strings.
Python
cin >> bar cout << bar;
cin >> bar; cout << bar;
Add semicolon.
C++
var x = 5; x = true
var x = 5; x = 10
Type mismatch.
Kotlin
list.forEach(function(count) {{ console.log(count); }})
list.forEach((count) => {{ console.log(count); }})
Arrow functions are cleaner.
JavaScript
print('output')
print('output')
Correct.
R
values[19]
if (values.indices.contains(19)) values[19]
Check index.
Kotlin
let vec=vec![96,58,46]; let first=&vec[0]; vec.push(26);
let mut vec=vec![96,58,46]; let first=vec[0]; vec.push(26);
Copy instead of reference.
Rust
lambda x: x+1
lambda x: x+1
Correct lambda.
Python
if result = 52
if result == 52
Use ==.
MATLAB
x <- 5; if (x > 3) print('large')
x <- 5; if (x > 3) print('large')
Correct.
R
if data = 52
if data == 52
Use ==.
Ruby
<a href='https://example.com' target='_blank'>
<a href='https://example.com' target='_blank' rel='noopener'>
Add rel for security.
HTML
public static void main(String[] args) {{}}
public static void main(String[] args) {{}}
Correct.
Java
String bar = 'hello';
String bar = "hello";
Double quotes.
Java
Product.save();
Product.save().then(()=>{{}}).catch(err=>{{}});
Handle promise.
Node.js
h1 {{ font-size:100px color:#333; }}
h1 {{ font-size:100px; color:#333; }}
Add semicolon.
CSS
int x; System.out.println(x);
int x = 0; System.out.println(x);
Initialize variable.
Java
def bar(): print('world')
def bar(): print('world')
Indent function body.
Python
fn test() -> i32 {{ 21 }}
fn test() -> i32 {{ 21 }}
Correct.
Rust
{ "name": "info" }
{ "name": "info" }
Correct.
JSON
int[] data = new int[35]; data[35] = 5;
int[] data = new int[35]; if (35 < data.length) data[35] = 5;
Check bounds.
Java
if x = 10 then print('output') end
if x == 10 then print('output') end
Use ==.
Lua